from rest_framework.views import exception_handler
from django.db import DatabaseError
from rest_framework.response import Response
from rest_framework import status

import logging
logger = logging.getLogger("django")

def custom_exception_handler(exc, context):
    """
    自定义异常处理函数
    :param exc: 异常类对象
    :param context: 抛出异常的上下文
    :return: Response响应对象
    """
    # 调用drf框架原生的异常处理方法
    response = exception_handler(exc, context)
    # if response is None:
    #     view = context["view"]
    #     """当response的值为None，则有可能出现2种情况: 没有发生异常，或者本次异常没有被drf进行处理"""
    #     if isinstance(exc, DatabaseError):
    #         # 数据库异常
    #         logger.error("数据库发生异常。view=%s，exc=%s" % (view, exc) )
    #         response = Response({'detail': '服务器内部错误'}, status=status.HTTP_507_INSUFFICIENT_STORAGE)

        # if isinstance(exc,Exception):
        #     # 未知异常
        #     logger.error("发生未知异常。view=%s，exc=%s" % (view, exc))
        #     response = Response({'detail': '服务器出现未知错误'}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

    return response